nodejs delete all problems in directory

NodeJS is a very popular JavaScript running environment, which allows us to use JavaScript language in back-end development. During the development process of NodeJS, we often encounter the situation of deleting all files in the directory. This article will introduce how to use NodeJS to delete all files in the directory.

1. NodeJS method of deleting all files in a directory

NodeJS provides the fs module to operate the file system. The rmdirSync and unlinkSync methods can help us delete directories and files. We can use these two methods, combined with recursion, to delete all files in the directory.

1. Recursively delete files

Let’s first look at how to delete files recursively:

const fs = require('fs')
const path = require('path')

function deleteFile(path) {
  let files = []
  if (fs.existsSync(path)) {
    files = fs.readdirSync(path)
    files.forEach((file, index) => {
      const curPath = path + '/' + file
      if (fs.statSync(curPath).isDirectory()) { // 如果是文件夹
        deleteFile(curPath) // 递归删除文件
      } else { // 删除文件
        fs.unlinkSync(curPath)
      }
    })
    fs.rmdirSync(path) // 删除文件夹本身
  }
}

In the above code, first determine whether the current directory exists, and if it exists, read Get all the files in the directory, and then traverse the file list. If it is a folder, it will call itself recursively to delete it; if it is a file, it will be deleted directly. Finally, delete the current folder itself.

2. Use promise to implement

The above method is executed synchronously. If you want to implement asynchronous execution, you can use promise to encapsulate it.

const fs = require('fs');
const path = require('path');
const { promisify } = require('util');

const unlink = promisify(fs.unlink);
const readdir = promisify(fs.readdir);
const rmdir = promisify(fs.rmdir);
const stat = promisify(fs.stat);

async function deleteFolder(path) {
  let files = await readdir(path);
  files = await Promise.all(files.map(file => {
    const curPath = path + '/' + file;
    return stat(curPath).then(stats => {
      if (stats.isDirectory()) {
        return deleteFolder(curPath);
      } else {
        return unlink(curPath);
      }
    });
  }));
  await rmdir(path);
}

In the above code, first use the promisify method to convert the readFile, readdir, rmdir and stat methods of fs into promises, and then use await to wait for the result of the promise. When traversing the file list, a promise is returned, and the Promise.all method needs to be used to convert the promise array into a single promise.

2. Precautions for deleting all files in the directory with NodeJS

When deleting all files in the directory, you need to pay attention to the following matters:

1. Perform permission check

Before performing the operation, you need to check whether the current user has sufficient permissions to perform the deletion operation, and you need to avoid accidentally deleting important files.

2. Error handling

If the error is not handled, the file may not be deleted, and the error needs to be handled through try-catch statements or callback functions.

3. Pay attention to the number of loop calls

If there are too many levels of recursively deleting files, it may lead to problems such as infinite loops or stack overflows, and the number of levels needs to be limited.

3. Summary

NodeJS provides the fs module to operate the file system, which can easily delete all files in the directory. We can combine recursion and promise to achieve asynchronous deletion. . When operating, you need to pay attention to issues such as permission checking, error handling, and the number of loop calls. In actual development, we flexibly use the above techniques according to needs to ensure the reliability and performance of the program.

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